WINNING MOVE: Marley Kaplan (inset) left Wall Street to head up Chess-in-the-Schools, which teaches the game to poor kids. Her $244,000 salary is way above average for such a position, watchdogs say. Photo: Getty Images

She’s never owned a new doll — until now.

Sweet 7-year-old Louise Cruz — “LC” to family and friends — has mothered dolls found dirt cheap at flea markets by her grandmother since her own mom abandoned her when she was 1.

She has played with goodwill Barbies and Cabbage Patch Kids — and a secondhand, life-sized Dora the Explorer, which her grandma saved up to buy. That doll was destroyed when the landlord tossed the family out of their Brooklyn apartment in September.

So Louise’s eyes opened wide when she saw the out-of-stock Lalaloopsy Mittens Fluff ‘N’ Stuff being offered by The Post in a giveaway contest in last Sunday’s paper.

She wrote a heart-wrenching letter to the paper, telling how her grandma — who cares for her and her seven siblings — could not afford the $25 doll even if it could be found in stores.

Louise explained that since she was no longer homeless, she could take good care of the doll.

“I’ll put my doll on my new bed and keep her clean,” she promised.

Last week, when Santa came down the chimney — actually, ascended the stairs to her tiny Bushwick walkup — the quiet little girl beamed.

“It’s nice,” she said. “I like her blue hair.”

LC said she’ll snuggle with her first out-of-the-box toy under the covers on one of the four air mattresses shared by her grandmother and seven siblings in the two-bedroom apartment.

Her grandma, Louise Frauenberg, 60, supports the tight-knit clan on the paycheck she earns at PS 240 in Brooklyn.

She has done what she could for every one of the kids, ages 23 to 7, since her daughter, now 41, abandoned them.

“I gave them the best thing they could have — a home,” Frauenberg said. “They could have been in foster care, but that’s not going to happen as long as I’m here. I’m going to take care of them.”